![]() Nothing special about them, you could solder with the same proceedure you'd use for any SMD passive, just use enough to make a fillet and you're good. Drag soldering is performed with an iron, flux, and solder wire.Ĭrellenations. Solder paste is typically used only for reflow or hot air soldering. I am trying to do drag soldering, should I buy a solder paste or or is flux and solder wire fine? Getting dispensers and a bottle of flux could be cheaper per unit volume, but it may be way more than you could ever use alone. I'd suggest you get one pen and see how long it lasts. Sure, but I'm guessing you're not in a production environment. I'm confused why you won't recommend the dispensing bottles (the ones with the needles), aren't they just the same as pena but refillable? Wow, I guess I've never seen that done with non-acid, non-plumbing solder before. The puck of paste I was referring to is this. ![]() It'll be more clear if you call them flux and solder paste. I'm looking to get flux not solder flux (the tiny balls thing) for any work. There's more than one way to do things, so experiment a bit and see what suits you. I'd use gel more often if it were cheaper. Keep in mind thatĪlmost all of my SMT assembly is done with pens (Kester #951) in combination with some nice thin (Kester 24-6337-0018) solder. You're not spreading metal everywhere, you just have to clean up the residue and you're going to do that anyway. Precision isn't really an issue with flux like it would be with paste. This is unavoidable unless you use gel flux because flux is a low viscosity liquid, it runs like water. You can't really draw with a flux pen, it's more of a watercolor thing. This pushes the nib into the pen and the flux runs out all over the local area. Pens dispense by pushing them down on the work. If flux has a high water content it'll pop and steam, throwing solder and flux everywhere (including your face).Īre pens good? I feel like they are less precise than squeeze bottle or syringe. The rest is distilled water, and won't evaporate out so easily, so it builds up in the mix. You can thin it again with isopropyl alcohol, just try to use 90% or higher. When the alcohol in flux evaporates off it turns to a gooey cement. Obviously I don't need to bug a new squeeze bottle each time. This isn't rare, and I've still got half the bottle. I only use this for large, very dirty solder joints when I work on tube gear from before the circuit board era. Back in 2012 I bought a 125ml bottle of RA from MG Chemicals and used hobby store paint dispenser bottles capped with a bent component lead to dispense it. It's supplied in small quantities as a preloaded syringe just like paste.įor the liquid squeeze bottles what do i order to refill them?įlux can be purchased in bottle form, but I can't really recommend it unless you're going in to heavy production. ![]() It's often used for rework, but it works great for drag soldering as well. Gel flux differs from paste in that it has no solder included. Small quantities of paste that are appropriate for hobby use are often supplied as a full syringe. Some paste syringes can be refilled, but often the dispensing needle is detached and the empty syringe is discarded. The use of 'paste' implies that solder is included in the mix and it is intended for oven reflow. Syringes can contain solder paste or gel flux. If it comes in a round tin and looks like lip balm then it's not meant for circuit boards.įor syringes how do you refill them? Do you refill them with paste or liquid? Flux paste is often acidic and used for copper plumbing pipe and brazing, and this is absolutely not for electronics. Solder paste contains tiny solder balls and is used for oven reflow. ![]() Solder paste and flux paste are different things. Mixing them up leads to damage and sorrow.įor paste how do you apply it of its all on one puck? Do you need to melt it onto the board area or do you just pull it out with your finger and apply with your hand? You may want to do a few youtube searches for the key words in the conversation below and see how each is used. They all have their merits and flaws, and this makes having more than one option helpful.
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